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Mangrove forests exist in intertidal areas of tropical zones and most are characterised by their complex root systems, which attenuates flow energy. Rhizophora species represents approximately 90% of the world mangrove distribution. Rhizophora plants are characterised by their aerial roots, which form a network above the substrate. However, there is a lack of knowledge regarding the hydrodynamics within these complex root systems, and the forces exerted by the flow on the tree elements. The large-scale experiments presented here joint to numerical simulations aims to better characterise flow energy dissipation provided by these ecosystems and the forces exerted on the trees.